the act or an instance of annihilating.
the state of being annihilated; extinction; destruction.
Also called pair annihilation. the process in which a particle and antiparticle unite, annihilate each other, and produce one or more photons. Compare positronium.
the conversion of rest mass into energy in the form of electromagnetic radiation.

1630–40; (< F) < Late Latin annihilātiōn- (stem of annihilātiō). See annihilate, -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
annihilation (əˌnaɪəˈleɪʃən)
1.  total destruction
2.  the act of annihilating
3.  physics the destruction of a particle and its antiparticle when they collide. The annihilation of an electron with a positron generates two or, very rarely, three photons of annihilation radiation. The annihilation of a nucleon with its antiparticle generates several pions

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1630s, from Fr. annihilation, restored from O.Fr. anichilacion (14c.), from L.L. annihilare (see annihilate).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Complete and utter annihilation by nuclear disaster and/or an asteroid
  collision with all of us on one planet was almost certain.
Suicide, self-destruction, auto-annihilation: these are not pretty words.
The gradual annihilation of distance will put human beings in closer contact
  and harmonize their views and aspirations.
Various plans are now being suggested for his painless annihilation or his
  undignified exit from the premises.
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